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While flights across the US have been cancelled due to the deep freeze of the polar vortex, flights in Bremen, Germany were cancelled for an entirely different reason: a UFO.

On Monday night, an unidentified flying object showed up on Bremen Airport’s radar several times over three hours from 6.30pm to 9.30pm, causing one flight to be cancelled, one diverted and other delayed as police and airport officials investigated the UFO activity.

A police helicopter was sent off in pursuit, but was unable to track down the UFO. A Bremen police spokesman told the Local,“We still don’t know what it was, but it was there.” The hunt for the UFO is still on as officers investigate the case on grounds of unauthorized intrusion into controlled air space. Possible explanations include that it was a drone, a balloon-like aircraft or aliens attempting to turn Earth into a breeding colony.

No word on whether Steven Spielberg has purchased the movie rights to this event yet.